My DC are 12 & 14. They've decided that they want to go vegan because it's "healthier". They've been vegetarian for almost 5 years because they just refuse to eat any meat or fish we serve to them (except the gravy and roast potatoes that they think are vegan 
). DH and I will absolutely not be going vegan, whether we let the DC do it or not. I've heard all the stories about vegan kids being malnourished etc, but AIBU to let them? DH thinks it's dangerous and inconvenient, but they'll be cooking for themselves, and surely they can just stop if they want/need to? Any advice would be appreciated!